CN114175839A

CN114175839A - Random access method, apparatus, communication apparatus, and computer-readable storage medium

Info

Publication number: CN114175839A
Application number: CN202180003475.4A
Authority: CN
Inventors: 牟勤
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2022-03-11
Anticipated expiration: 2041-11-01
Also published as: CN114175839B; WO2023070679A1; CN118075912A

Abstract

The present disclosure relates to a random access method, comprising: sending MsgA to a base station; receiving a Random Access Response (RAR) sent by the base station; and in response to the RAR being a fallback random access response fallback RAR, re-initiating random access or sending the Msg3 according to the indication of the base station. According to the disclosure, after sending MsgA to the base station, if the reccap terminal receives the RAR sent by the base station and determines that the received RAR is a fallback RAR, the reccap terminal may directly re-initiate random access, or send Msg3 according to an instruction of the base station. Since it is difficult for the base station to determine whether to configure the terminal to transmit Msg3 on the first Initial UL BWP or Msg3 on the second Initial UL BWP, which may cause the resource configured to the terminal for transmitting Msg3 to be inappropriate, the terminal may avoid transmitting Msg3 on inappropriate resources by directly re-initiating random access, which may cause communication problems, such as resource collision avoidance.

Description

Random access method, apparatus, communication apparatus, and computer-readable storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a random access method, a random access apparatus, a communication apparatus, and a computer-readable storage medium.

Background

With the development of communication technology, in order to adapt to a new communication scenario, a Reduced capability (Reduced capability) terminal, called as a red cap terminal for short, which may also be called as NR-lite, is proposed, and such a terminal generally needs to satisfy conditions of low cost, low complexity, enhanced coverage to a certain degree, power saving, and the like.

Since a redmap terminal and a Non-redmap (Non-redmap) terminal are different from each other, when accessing a network, in order to enable the network to determine the type of an access terminal, the redmap terminal may carry information indicating its own type when initiating a random access, for example, when initiating a two-step random access, early indication may be performed through a Physical Uplink Shared Channel (PUSCH) in a random access message MsgA to indicate whether the terminal initiating the random access is a redmap terminal.

If the base station does not correctly demodulate the PUSCH in the MsgA, a fallback Random Access Response RAR (Random Access Response) is sent to the terminal, wherein the fallback RAR carries configuration information, so that the terminal sends a Random Access message Msg3 to the base station according to the configuration information, and the Msg3 is a third message in a four-step Random Access process, wherein the carried content is the same as or similar to the PUSCH in the MsgA. In some scenarios, however, the base station cannot determine how to configure the terminal sending Msg 3.

Disclosure of Invention

In view of the above, embodiments of the present disclosure provide a random access method, a random access apparatus, a communication apparatus, and a computer-readable storage medium to solve technical problems in the related art.

According to a first aspect of the embodiments of the present disclosure, a random access method is provided, which is applicable to a first type of terminal, where the first type of terminal is configured to carry terminal type indication information in a physical uplink shared channel PUSCH of a random access message MsgA, and the method includes: sending MsgA to a base station; receiving a Random Access Response (RAR) sent by the base station; and in response to the RAR being a fallback random access response fallback RAR, re-initiating random access or sending the Msg3 according to the indication of the base station.

According to a second aspect of the embodiments of the present disclosure, a random access method is provided, which is applied to a base station, and the method includes: receiving MsgA sent by a first type terminal; sending a Random Access Response (RAR) to the terminal, wherein the RAR is a fallback RAR; random access reinitiated by the receiving terminal or Msg3 sent by the receiving terminal.

According to a third aspect of the embodiments of the present disclosure, a random access apparatus is provided, which is adapted to a first type terminal configured to carry terminal type indication information in a physical uplink shared channel, PUSCH, of a random access message MsgA, and includes one or more processors configured to: sending MsgA to a base station; receiving a Random Access Response (RAR) sent by the base station; and in response to the RAR being a fallback random access response fallback RAR, re-initiating random access or sending the Msg3 according to the indication of the base station.

According to a fourth aspect of the embodiments of the present disclosure, a random access apparatus is provided, which is applicable to a base station, and includes one or more processors configured to: receiving MsgA sent by a first type terminal; sending a Random Access Response (RAR) to the terminal, wherein the RAR is a fallback RAR; random access reinitiated by the receiving terminal or Msg3 sent by the receiving terminal.

According to a fifth aspect of the embodiments of the present disclosure, there is provided a communication apparatus including: a processor; a memory for storing a computer program; wherein the computer program, when executed by a processor, implements the random access method applicable to the first type of terminal as described in any of the above embodiments.

According to a sixth aspect of the embodiments of the present disclosure, there is provided a communication apparatus including: a processor; a memory for storing a computer program; wherein the computer program, when executed by a processor, implements the random access method applicable to the base station according to any of the above embodiments.

According to a seventh aspect of embodiments of the present disclosure, a computer-readable storage medium is proposed, which is used for storing a computer program, and when the computer program is executed by a processor, the steps in the random access method applicable to the first type terminal as described in any of the above embodiments are implemented.

According to an eighth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps in the random access method applicable to the base station according to any of the above embodiments.

According to the embodiment of the disclosure, after the red beacon terminal sends MsgA to the base station, if the RAR sent by the base station is received and the received RAR is determined to be a fallback RAR, in one embodiment, the random access may be directly re-initiated, and in another embodiment, the Msg3 may be sent according to an instruction of the base station.

Since it is difficult for the base station to determine whether to configure the terminal to transmit Msg3 on the first Initial UL BWP or Msg3 on the second Initial UL BWP, which may cause the resource configured to the terminal for transmitting Msg3 to be inappropriate, the terminal may avoid transmitting Msg3 on inappropriate resources by directly re-initiating random access, which may cause communication problems, such as resource collision avoidance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic flow chart diagram illustrating a random access method according to an embodiment of the present disclosure.

Fig. 2 is a schematic flow chart diagram illustrating another random access method according to an embodiment of the present disclosure.

Fig. 3 is a schematic flow chart diagram illustrating yet another random access method according to an embodiment of the present disclosure.

Fig. 4 is a schematic flow chart diagram illustrating a random access method according to an embodiment of the present disclosure.

Fig. 5 is a schematic flow chart diagram illustrating another random access method according to an embodiment of the present disclosure.

Fig. 6 is a schematic flow chart diagram illustrating yet another random access method according to an embodiment of the present disclosure.

Fig. 7 is a schematic block diagram illustrating an apparatus for random access in accordance with an embodiment of the present disclosure.

Fig. 8 is a schematic block diagram illustrating an apparatus for random access in accordance with an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The terminology used in the embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present disclosure. As used in the disclosed embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information in the embodiments of the present disclosure, such information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of embodiments of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

For the purposes of brevity and ease of understanding, the terms "greater than" or "less than", "above" or "below" are used herein when characterizing a size relationship. But it will be understood by those skilled in the art that: the term "greater than" also covers the meaning of "greater than or equal to," less than "also covers the meaning of" less than or equal to "; the term "higher than" encompasses the meaning of "higher than equal to" and "lower than" also encompasses the meaning of "lower than equal to".

Fig. 1 is a schematic flow chart diagram illustrating a random access method according to an embodiment of the present disclosure. The random access method shown in this embodiment may be applied to a first type terminal, where the first type terminal is configured to carry terminal type indication information in a physical uplink shared channel PUSCH of a random access message MsgA, the first type terminal may communicate with a base station, the terminal includes but is not limited to a mobile phone, a tablet computer, a wearable device, a sensor, an internet of things device, and other communication devices, and the base station includes but is not limited to a base station in a communication system such as a 4G base station, a 5G base station, and a 6G base station.

As shown in fig. 1, the random access method initiation may include the following steps:

in step S101, a random access message MsgA is sent to the base station;

in step S102, receiving a random access response RAR sent by the base station;

in step S103, in response to the RAR being a fallback random access response fallback RAR, re-initiating random access or sending Msg3 according to an instruction of the base station.

In one embodiment, the terminal may initiate random access to the base station to access the base station, for example, initiate two-step random access or initiate four-step random access.

In the four-step random access process, the random access message MsgA is the first message Msg 1. Namely: the terminal firstly sends a Random Access message Msg1 to the terminal, wherein the Random Access message Msg1 carries a preamble of a Physical Random Access Channel (PRACH);

after detecting the preamble, the base station sends a random access response RAR, which may also be referred to as a second message Msg2, to the terminal, where the RAR may carry an identifier ID of the detected preamble, a timing advance related command, and a temporary C-RNTI (Cell-radio network temporary identifier), which may also be referred to as a TC-RNTI, and may also carry resource allocation information, where the resource allocation information is used to indicate a resource of the random access message Msg3 sent by the terminal;

after receiving the RAR, the terminal may send a third message Msg3 to the base station, where Msg3 is mainly a PUSCH, and the specific content carried therein is not fixed and depends on an actual scenario;

after receiving the Msg3, the base station sends a contention resolution message, which may be called a fourth message Msg4, to the terminal by using the contention resolution identification ID;

after receiving the Msg4, the terminal acquires the contention resolution identity ID therein, and then sends a confirmation message to the base station on a Physical Uplink Control Channel (PUCCH), thereby completing the four-step random access process.

It can be seen that the four-step access procedure requires at least two cycles of round trip communication between the terminal and the base station, which increases the latency of the access procedure to some extent and also creates additional signaling overhead, and therefore, in some cases, these problems can be alleviated by two-step random access.

In the two-step random access process, the terminal sends a random access message MsgA to the base station, wherein the MsgA consists of a PRACH preamble and a PUSCH, is equivalent to Msg1 and Msg3 in the four-step random access process, and can transmit the Msg1 in a PRACH Occasion (PO) in the four-step random access process or in an independent PO (for example, in a PO special for the two-step random access);

after receiving the MsgA, the base station sends a response message MsgB to the terminal, wherein the response message MsgB comprises a random access response and a contention resolution message, and the response message MsgB is equivalent to Msg2 and Msg4 in a four-step random access process.

Therefore, the interaction process between the base station and the terminal in the access process can be reduced based on the two-step random access process, which is beneficial to reducing the time delay of the access process and saving the signaling overhead, for example, the terminal and the base station communicate in an unlicensed frequency band, and the number of times of listening Before speaking (Listen Before Talk, LBT) attempts in the unlicensed frequency band is facilitated due to the fewer interaction times required in the two-step random access process.

In the two-step random access process, after the terminal sends the random access message MsgA, the receiving base station sends the response message MsgB, and there can be three situations:

in case one, the base station does not detect the PRACH preamble in the MsgA, and therefore does not send a response to the terminal, that is, does not send MsgB to the terminal, and the terminal does not receive MsgB after waiting, and may resend MsgA, or fall back to the four-step random access process to send Msg 1;

in case two, the base station detects the PRACH preamble in the MsgA, but fails to decode the PUSCH in the MsgA correctly, then a fallback RAR may be sent to the terminal, where the fallback RAR at least carries resource allocation information, such as an uplink grant UL grant, for indicating the terminal to transmit the resource of Msg3, and after receiving the fallback RAR, the terminal may send Msg3 according to the indicated resource, which is equivalent to a fallback to a four-step random access procedure;

and in the third case, the base station detects the PRACH preamble in the MsgA, correctly decodes the PUSCH in the MsgA, and returns the MsgB to the terminal, wherein a successful random access response success RAR can be carried, the success RAR can carry a competition resolving identifier ID, a C-RNTI, a timing advance command and the like, and the terminal can determine that the two-step random access process is successfully completed after receiving the MsgB.

In one embodiment, the base station configures the Initial UL BWP of the first type terminal as the first Initial UL BWP, and configures the Initial UL BWP of the second type terminal as the second Initial UL BWP.

In one embodiment, the first type of terminal includes a reduced capability RedCap terminal and the second type of terminal includes a Non-RedCap terminal, which may also be referred to as a legacy terminal, Non-RedCap terminal.

For a reccap terminal, in order to enable a network to determine the type of the terminal as soon as possible, when a two-step random access procedure is initiated, early indication may be performed through a PUSCH in an MsgA, and the indication manner may be display indication or implicit indication, which is used to indicate the type of the terminal where the terminal initiates random access, for example, whether the terminal is a reccap terminal.

In addition, since there may be legacy (legacy) terminals in the network, that is, Non-capability-reduced recap (Non-recap) terminals, or capability-reduced recap terminals, in order to avoid collision between terminals of different types when initiating random access, the base station may configure different Initial uplink Bandwidth Part (Bandwidth Part) UL BWPs for the recap terminals and the Non-recap terminals, so that the recap terminals and the Non-recap terminals may respectively use different Initial UL BWPs to initiate random access.

For convenience of description, the Initial UL BWP configured for the rdcap terminal is referred to as a first Initial UL BWP, the Initial UL BWP configured for the non-rdcap terminal is referred to as a second Initial UL BWP, and the first Initial UL BWP and the second Initial UL BWP are different. In all embodiments of the present disclosure, the first Initial UL BWP and the second Initial UL BWP may be different, for example, one or more of the following:

the wide bandwidth of the first Initial UL BWP and the wide bandwidth of the second Initial UL BWP are different;

the starting position and/or the ending position of the first Initial UL BWP and the second Initial UL BWP are different.

In some possible embodiments, the first Initial UL BWP and the second Initial UL BWP may have overlapping portions, or the first Initial UL BWP and the second Initial UL BWP do not overlap at all, or the first Initial UL BWP is completely contained within the second Initial UL BWP, or the second Initial UL BWP is completely contained within the first Initial UL BWP.

In one possible implementation, the Initial UL BWP configured for the red beacon terminal is referred to as a first Initial UL BWP, and is dedicated for the red beacon terminal. The Initial UL BWP configured for the non-redtap terminal is called as a second Initial UL BWP, and may be configured for the redtap terminal or the non-redtap terminal.

In this case, for the second case of the two-step random access, the base station does not correctly demodulate PUSCH in MsgA, and thus cannot correctly acquire early indication, and thus cannot determine the type of the terminal initiating the random access, and therefore cannot determine whether to configure the terminal to transmit Msg3 on the first Initial UL BWP or transmit Msg3 on the second Initial UL BWP.

According to the embodiment of the disclosure, after the red beacon terminal sends MsgA to the base station, if the RAR sent by the base station is received and it is determined that the received RAR is a fallback RAR, in one possible embodiment, the random access may be directly re-initiated, and in another possible embodiment, the Msg3 may be sent according to an instruction of the base station.

The base station may instruct the terminal as necessary, instruct the terminal to send Msg3 when receiving the fallback RAR, instruct the terminal, for example, by using the fallback RAR, instruct the terminal in advance by using system information or other downlink signaling, or determine the terminal according to a communication standard. Accordingly, whether the terminal sends the Msg3 when receiving the fallback RAR can be flexibly controlled.

In one embodiment, the re-initiating random access comprises:

re-initiating two-step random access; or

And re-initiating the four-step random access.

In an embodiment, the random access that is reinitiated by the terminal may be two-step random access or four-step random access, and may be specifically set as required.

In one embodiment, the re-initiating two-step random access comprises:

and reinitiating the two-step random access on the physical random access channel PRACH resources special for the two-step random access.

In one embodiment, the re-initiating four-step random access comprises:

and reinitiating the four-step random access at the PRACH resource special for the first type terminal.

Fig. 2 is a schematic flow chart diagram illustrating another random access method according to an embodiment of the present disclosure. As shown in fig. 2, before sending Msg3 according to the indication of the base station, the method further includes:

in step S201, it is determined whether to re-initiate random access in case of receiving a fallback RAR according to the indication of the base station.

In one embodiment, the method further comprises:

in step S202, in response to determining that random access is not to be re-initiated in the case of receiving a fallback RAR, a random access message Msg3 is sent to the base station according to the fallback RAR.

In an embodiment, the base station may instruct the terminal as needed, and instruct the terminal whether to re-initiate the random access when receiving the fallback RAR, for example, the instruction of the base station may be implemented by the fallback RAR or broadcast information, for example, by instructing the fallback RAR, or instructing the terminal in advance through broadcast information (e.g., system information). The indication of the base station includes a display indication or an implicit indication, that is, the terminal may be indicated in a display manner, or the terminal may be indicated in an implicit manner.

The terminal may determine whether to reinitiate the random access upon receiving the fallback RAR according to the indication of the base station, may send Msg3 to the base station upon determining not to reinitiate the random access, and reinitiate the two-step random access or the four-step random access upon determining to reinitiate the random access. Accordingly, the base station can flexibly control whether the terminal sends the Msg3 when receiving the fallback RAR.

Fig. 3 is a schematic flow chart diagram illustrating yet another random access method according to an embodiment of the present disclosure. As shown in fig. 3, the re-initiating the random access in response to the RAR being a fallback random access response RAR includes:

in step S301, in response to the RAR being a fallback random access response RAR, determining whether a preset configuration is configured;

in step S302, in response to determining that the terminal is configured with the preset configuration, the random access is re-initiated.

In another embodiment, the method comprises:

in response to not being configured with the preset configuration, sending Msg3 to the base station in step S303.

In yet another embodiment, the method further comprises:

In one embodiment, in addition to the manner indicated by the base station, the base station may configure a preset configuration for the terminal, so that the terminal does not send the Msg3 based on the fallback RAR but re-initiates the random access when receiving the fallback RAR.

In the embodiments of the present disclosure, the preset configuration may be configured by the base station to the terminal, or determined by the terminal according to the communication protocol, or preset in the terminal.

In one embodiment, the preset configuration comprises at least one of:

the Initial uplink bandwidth part (Initial UL BWP) configured by the first type terminal is different from the Initial UL BWP configured by the second type terminal;

the Initial UL BWP configured by the first type terminal and the Initial UL BWP configured by the second type terminal share PRACH resources;

the Initial UL BWP configured by the second type terminal is larger than the maximum bandwidth supported by the first type terminal;

the mechanism that the first type terminal carries the terminal type indication information in Msg3 is disabled;

the first type terminal transmits the Msg3 based on an intra-slot frequency hopping scheme, and the frequency hopping amplitude in the intra-slot frequency hopping scheme is larger than the maximum bandwidth supported by the first type terminal.

In the above embodiments, the different preset configurations may be determined based on different manners, which is not described herein again.

In one embodiment, in the case that the Initial UL BWP configured for the first type terminal is determined to be different from the Initial UL BWP configured for the second type terminal, since this may make it difficult for the base station to accurately determine whether to configure the terminal to send Msg3 on the first Initial UL BWP or send Msg3 on the second Initial UL BWP, which may cause that the resource configured for the terminal to send Msg3 is not appropriate, the random access may be re-initiated instead of sending Msg3 based on the fallback RAR in the case that the fallback RAR is received, so as to avoid sending Msg3 on an inappropriate resource to cause communication problems, such as avoiding resource collision.

In one embodiment, in the case that the first type terminal determines that the Initial UL BWP configured for the first type terminal shares PRACH resources with the Initial UL BWP configured for the second type terminal, it is difficult for the base station to distinguish the types of the two terminals according to the BWPs where the two terminals initiate random access, and therefore it is difficult to accurately determine whether to configure the terminal to send Msg3 on the first Initial UL BWP or send Msg3 on the second Initial UL BWP, which may cause that the resource configured for sending Msg3 to the terminal is not appropriate, and therefore may not send Msg3 based on fallback RAR but re-initiate random access in the case of receiving fallback RAR, so as to avoid sending Msg3 on inappropriate resources to cause communication problems, for example, avoid resource collision.

It should be noted that, even if the Initial UL BWP configured for the first type terminal and the Initial UL BWP configured for the second type terminal do not share the PRACH resource, the base station may not necessarily be able to distinguish the types of the two terminals according to the BWP where the two terminals initiate random access.

In one embodiment, in the case that the first-type terminal determines that the Initial UL BWP configured for the second-type terminal is greater than the maximum bandwidth (maximum UE BW) supported by the first-type terminal, even if the base station configures the first-type terminal to send Msg3 on the second Initial UL BWP through the fallback RAR, the first-type terminal cannot well send Msg3 on the second Initial UL BWP because the second Initial UL BWP is greater than the maximum bandwidth supported by the first-type terminal, and therefore Msg3 may not be sent based on the fallback RAR, but random access is re-initiated, thereby avoiding the problem of sending Msg3 on the unsupported bandwidth.

In an embodiment, when the first-type terminal determines that a mechanism for the first-type terminal to carry the terminal type indication information in the Msg3 is invalid, for example, the first-type terminal is a red beacon terminal and the terminal type indication information is early indication, the terminal cannot carry the terminal type indication information in the Msg3 sent according to a fallback RAR, but can carry the terminal type indication information in a subsequent initiated random access procedure, so that the random access procedure can be reinitiated and the terminal type indication information is sent to the base station.

In one embodiment, in a case that it is determined that the first type terminal transmits Msg3 based on the intra-slot hopping scheme and the hop amplitude in the intra-slot hopping scheme is greater than the maximum bandwidth supported by the first type terminal, even if the base station configures the first type terminal to transmit Msg3 based on the intra-slot hopping scheme through a fallback RAR, since the hop amplitude in the configured intra-slot hopping scheme is greater than the maximum bandwidth supported by the first type terminal, the first type terminal cannot well support the hop transmission of the scheme, the first type terminal may not send Msg3 based on the fallback RAR but re-initiate a random access, thereby avoiding a problem of sending Msg3 based on an unsupported hopping scheme.

Fig. 4 is a schematic flow chart diagram illustrating a random access method according to an embodiment of the present disclosure. The random access method shown in this embodiment may be applied to a base station, where the base station may communicate with a terminal, for example, a first type terminal, where the first type terminal includes, for example, a reduced capability RedCap terminal, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a wearable device, a sensor, an internet of things device, and other communication devices, and the base station includes, but is not limited to, a base station in a communication system such as a 4G base station, a 5G base station, and a 6G base station.

As shown in fig. 4, the random access method includes:

in step S401, receiving MsgA sent by a first type terminal;

in step S402, a random access response RAR is sent to the terminal, where the RAR is a fallback random access response fallback RAR;

in step S403, the random access reinitiated by the receiving terminal or the Msg3 sent by the receiving terminal is received.

In one possible implementation, the base station sends a fallback RAR to the terminal in response to not correctly demodulating the PUSCH in the MsgA; in another possible implementation, the base station responds to failing to demodulate the corresponding Preamble in MsgA. As will be explained in detail later.

In one implementation, in response to a terminal being configured with a preset configuration and receiving a fallback RAR, the terminal re-initiates a random access. In another implementation, in response to the terminal not being configured with the preset configuration and receiving a fallback RAR, the terminal sends Msg3 to the base station.

Namely: the step 403 may be: receiving random access initiated by the terminal again; the random access is the random access which is initiated by the terminal again under the condition that the terminal is configured with preset configuration and receives fallback RAR.

Or, the step 403 may be: receiving the Msg3 sent by the terminal; the Msg3 is Msg3 sent by the terminal when the terminal is not configured with a preset configuration and receives a fallback RAR.

In the four-step Random Access process, the terminal firstly sends a Random Access message Msg1 to the terminal, wherein the Random Access message Msg1 carries a preamble of a Physical Random Access Channel (PRACH);

after receiving the RAR, the terminal can send Msg3 to the base station, wherein Msg3 is mainly PUSCH, and the specific content carried by the Msg3 is not fixed and depends on an actual scene;

and after receiving the MsgA, the base station sends MsgB to the terminal, wherein the MsgB comprises a random access response and a contention resolution message, and the message is equivalent to Msg2 and Msg4 in a four-step random access process.

In the two-step random access process, after the terminal sends MsgA, the receiving base station sends MsgB, and there may be three situations:

For a reccap terminal, in order to enable a network to determine the type of the terminal as soon as possible, when a two-step random access procedure is initiated, early indication may be performed through a PUSCH in an MsgA, and the indication manner may be display indication or implicit indication, which is used to indicate the type of the terminal where the terminal initiates random access, for example, whether the terminal is a reccap terminal. In all embodiments of the present disclosure, explicit indication may refer to indication in an explicit manner, such as by an explicit indicator/field/bit. In all embodiments of the present disclosure, implicit indication may refer to indication by way of coding or other means.

In addition, because there may be a legacy terminal in the network, that is, a Non-capability-reduced-red-ap (Non-red-ap) terminal, or a capability-reduced-red-ap terminal, in order to avoid a collision occurring when random access is initiated between different types of terminals, the base station may configure different Initial uplink Bandwidth Part (Bandwidth Part) UL BWPs for the red-ap terminal and the Non-red-ap terminal, so that the red-ap terminal and the Non-red-ap terminal may respectively use different Initial UL BWPs to initiate random access.

For convenience of description, the Initial UL BWP configured by the base station for the recap terminal is referred to as a first Initial UL BWP, the Initial UL BWP configured for the non-recap terminal is referred to as a second Initial UL BWP, and the first Initial UL BWP and the second Initial UL BWP are different.

Since it is difficult for the base station to determine whether to configure the terminal to transmit Msg3 on the first Initial UL BWP or Msg3 on the second Initial UL BWP, which may result in inappropriate resources configured for transmitting Msg3, the terminal may avoid communication problems, such as resource collision, caused by transmitting Msg3 on inappropriate resources by directly re-initiating random access, and the base station may receive random access re-initiated by the terminal.

The base station may instruct the terminal as necessary, and instruct the terminal to transmit the Msg3 when receiving the fallback RAR, for example, to instruct the terminal through the fallback RAR or to instruct the terminal in advance through system information. Accordingly, whether the terminal sends the Msg3 when receiving the fallback RAR can be flexibly controlled. In the embodiment of the present disclosure, the base station may instruct, as needed, the terminal to send the Msg3 when receiving the fallback RAR, for example, instruct through the fallback RAR, or instruct in advance through system information or other downlink signaling, or determine according to a communication standard. Accordingly, whether the terminal sends the Msg3 when receiving the fallback RAR can be flexibly controlled.

Fig. 5 is a schematic flow chart diagram illustrating another random access method according to an embodiment of the present disclosure. As shown in fig. 5, the method further comprises:

in step S501, it is indicated to the terminal whether to re-initiate random access upon receiving a fallback RAR.

In one embodiment, the Msg3 sent by the receiving terminal includes:

in step S502, in response to an instruction to the terminal not to re-initiate random access in the case of receiving a fallback RAR, receiving the Msg3 sent by the terminal according to the fallback RAR.

The terminal may determine whether to re-initiate the random access under the condition of receiving the fallback RAR according to the indication of the base station, and may send Msg3 to the base station under the condition of determining not to re-initiate the random access, so that the base station may receive Msg3 sent by the terminal according to the fallback RAR, and re-initiate the two-step random access or the four-step random access under the condition of determining to re-initiate the random access. Accordingly, the base station can flexibly control whether the terminal sends the Msg3 when receiving the fallback RAR.

Fig. 6 is a schematic flow chart diagram illustrating yet another random access method according to an embodiment of the present disclosure. As shown in fig. 6, the method further comprises:

in step S601, in response to determining that the terminal configures a preset configuration, prohibiting the first type terminal from carrying terminal type indication information in a PUSCH of MsgA.

In one embodiment, the preset configuration comprises at least one of:

the Initial UL BWP configured by the first type terminal is different from the Initial UL BWP configured by the second type terminal;

the mechanism that the first type terminal carries the terminal type indication information in Msg3 is deactivated;

the first type terminal transmits the Msg3 based on a time slot inner frequency hopping scheme, and the frequency hopping amplitude in the time slot inner frequency hopping scheme is larger than the maximum bandwidth supported by the first type terminal.

In one embodiment, in the case where the Initial UL BWP configured for the first type terminal is different from the Initial UL BWP configured for the second type terminal, it may be inappropriate to configure the resource for sending Msg3 to the terminal because such a situation may make it difficult for the base station to accurately determine whether to configure the terminal to send Msg3 on the first Initial UL BWP or to send Msg3 on the second Initial UL BWP. Then, the first type terminal may be prohibited from carrying the terminal type indication information in the PUSCH of the MsgA, for example, the RedCap terminal is prohibited from carrying the early indication information in the PUSCH of the MsgA, so that the terminal does not carry the terminal type indication information in the PUSCH of the MsgA, and the base station does not need to determine the terminal type by parsing the PUSCH of the MsgA, but may determine the terminal type in another way, so as to accurately determine whether to configure the terminal to send Msg3 on the first Initial UL BWP or send Msg3 on the second Initial UL BWP after accurately determining the terminal type.

In one embodiment, in the case where the Initial UL BWP where the first type of terminal is configured shares PRACH resources with the Initial UL BWP where the second type of terminal is configured, it is difficult for the base station to distinguish the types of the two terminals according to the BWPs where the two terminals initiate random access, and thus it is difficult to accurately determine whether to configure the terminal to transmit Msg3 on the first Initial UL BWP or to transmit Msg3 on the second Initial UL BWP, which may result in inappropriate resources configured for the terminal to transmit Msg 3. Then, the first type terminal may be prohibited from carrying the terminal type indication information in the PUSCH of the MsgA, for example, the RedCap terminal is prohibited from carrying the early indication information in the PUSCH of the MsgA, so that the terminal does not carry the terminal type indication information in the PUSCH of the MsgA, and the base station does not need to determine the terminal type by parsing the PUSCH of the MsgA, but may determine the terminal type in another way, so as to accurately determine whether to configure the terminal to send Msg3 on the first Initial UL BWP or send Msg3 on the second Initial UL BWP after accurately determining the terminal type.

In one embodiment, in the case that the Initial UL BWP configured for the second type terminal is greater than the maximum bandwidth supported by the first type terminal (maximum UE BW), even if the base station configures the first type terminal to send Msg3 on the second Initial UL BWP through fallback RAR, since the second Initial UL BWP is greater than the maximum bandwidth supported by the first type terminal, the first type terminal cannot send Msg3 on the second Initial UL BWP well, the first type terminal may be prohibited from carrying the terminal type indication information in the PUSCH of MsgA, for example, the red ap terminal is prohibited from carrying the terminal type indication in the PUSCH of MsgA, so that the terminal does not carry the terminal type indication information in the PUSCH of MsgA, and the base station need not determine the terminal type by parsing the PUSCH of MsgA, but may determine the terminal type in other ways to accurately determine the terminal type, accurately determining whether a configured terminal sends Msg3 on a first Initial UL BWP or Msg3 on a second Initial UL BWP

In one embodiment, in a case where it is determined that the mechanism for the first-type terminal to carry the terminal type indication information in the Msg3 is disabled, for example, the first-type terminal is a RedCap terminal and the terminal type indication information is early indication, the terminal cannot carry the terminal type indication information in the Msg3 sent according to a fallback RAR. Then, the first type terminal may be prohibited from carrying the terminal type indication information in the PUSCH of the MsgA, for example, the RedCap terminal is prohibited from carrying the early indication information in the PUSCH of the MsgA, so that the terminal does not carry the terminal type indication information in the PUSCH of the MsgA, and the base station does not need to determine the terminal type by parsing the PUSCH of the MsgA, but may determine the terminal type in other ways, so as to accurately determine whether to configure the terminal to send Msg3 on the first Initial UL BWP or send Msg3 on the second Initial UL BWP after accurately determining the terminal type

In one embodiment, in the case that it is determined that the first type terminal transmits Msg3 based on the intra-slot hopping scheme and the hop amplitude in the intra-slot hopping scheme is greater than the maximum bandwidth supported by the first type terminal, even if the base station configures the first type terminal to transmit Msg3 based on the intra-slot hopping scheme through the fallback RAR, the first type terminal cannot well support the hop transmission of the scheme because the hop amplitude in the configured intra-slot hopping scheme is greater than the maximum bandwidth supported by the first type terminal. Then, the first type terminal may be prohibited from carrying the terminal type indication information in the PUSCH of the MsgA, for example, the RedCap terminal is prohibited from carrying the early indication information in the PUSCH of the MsgA, so that the terminal does not carry the terminal type indication information in the PUSCH of the MsgA, and the base station does not need to determine the terminal type by parsing the PUSCH of the MsgA, but may determine the terminal type in other ways, so as to accurately determine whether to configure the terminal to send Msg3 on the first Initial UL BWP or send Msg3 on the second Initial UL BWP after accurately determining the terminal type

Corresponding to the foregoing embodiments of the random access method, the present disclosure also provides embodiments of a random access apparatus.

Embodiments of the present disclosure provide a random access apparatus, which may be applicable to a first type of terminal, where the first type of terminal is configured to carry terminal type indication information in a physical uplink shared channel PUSCH of a random access message MsgA, the first type of terminal may communicate with a base station, the terminal includes but is not limited to a mobile phone, a tablet computer, a wearable device, a sensor, an internet of things device, and other communication apparatuses, and the base station includes but is not limited to a base station in a communication system such as a 4G base station, a 5G base station, and a 6G base station.

In one embodiment, the first type of terminal is configured to carry terminal type indication information in a physical uplink shared channel, PUSCH, of a random access message, MsgA, the apparatus comprising one or more processors configured to:

sending MsgA to a base station;

receiving a Random Access Response (RAR) sent by the base station;

and in response to the RAR being a fallback random access response fallback RAR, re-initiating random access or sending the Msg3 according to the indication of the base station.

In one embodiment, the processor is configured to:

re-initiating two-step random access; or

And re-initiating the four-step random access.

In one embodiment, the processor is configured to:

In one embodiment, the processor is further configured to:

and determining whether to reinitiate random access under the condition of receiving the fallback RAR according to the indication of the base station.

In one embodiment, the processor is further configured to:

and in response to determining that the random access is not reinitiated under the condition that the fallback RAR is received, sending a random access message Msg3 to the base station according to the fallback RAR.

In one embodiment, the indication of the base station comprises a display indication or an implicit indication.

In one embodiment, the indication of the base station is implemented by the fallback RAR or broadcast information.

In one embodiment, the processor is configured to:

responding to the RAR as a fallback random access response fallback RAR, and determining whether preset configuration is configured or not;

and re-initiating the random access in response to being configured with the preset configuration.

In one embodiment, the processor is further configured to:

in response to not being configured with a preset configuration, sending Msg3 to the base station.

In one embodiment, the preset configuration comprises at least one of:

In one embodiment, the first type of endpoint includes a non-capability-reducing RedCap endpoint and the second type of endpoint includes a RedCap endpoint.

Embodiments of the present disclosure provide a random access apparatus, which may be suitable for a base station, where the base station may communicate with a terminal, for example, a first type terminal, for example, a reduced capability reccap terminal, where the terminal includes, but is not limited to, a mobile phone, a tablet computer, a wearable device, a sensor, an internet of things device, and other communication apparatuses, and the base station includes, but is not limited to, a base station in a communication system such as a 4G base station, a 5G base station, a 6G base station.

In one embodiment, the apparatus comprises one or more processors configured to:

receiving MsgA sent by a first type terminal;

responding to the fact that the PUSCH in the MsgA is not correctly demodulated, and sending a fallback RAR to the terminal;

and receiving the random access reinitiated by the terminal.

In one embodiment, the processor is further configured to:

indicating to the terminal whether to re-initiate random access upon receiving a fallback RAR.

In one embodiment, the processor is configured to:

and in response to the indication that the random access is not reinitiated under the condition that the fallback RAR is received, receiving the Msg3 sent by the terminal according to the fallback RAR.

In one embodiment, the processor is further configured to:

and in response to the configuration of the preset configuration for the terminal, prohibiting the first type terminal from carrying terminal type indication information in the PUSCH of the MsgA.

In one embodiment, the preset configuration comprises at least one of:

With regard to the apparatus in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments of the related method, and will not be described in detail here.

For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

An embodiment of the present disclosure also provides a communication apparatus, including: a processor; a memory for storing a computer program; wherein the computer program, when executed by a processor, implements the random access method applicable to the first type of terminal as described in any of the above embodiments.

An embodiment of the present disclosure also provides a communication apparatus, including: a processor; a memory for storing a computer program; wherein the computer program, when executed by a processor, implements the random access method applicable to the base station according to any of the above embodiments.

Embodiments of the present disclosure also provide a computer-readable storage medium for storing a computer program, which, when being executed by a processor, implements the steps of the random access method applicable to the first type terminal according to any of the above embodiments.

Embodiments of the present disclosure also provide a computer-readable storage medium for storing a computer program, which, when being executed by a processor, implements the steps in the random access method applicable to the base station according to any of the above embodiments.

As shown in fig. 7, fig. 7 is a schematic block diagram illustrating an apparatus 700 for random access in accordance with an embodiment of the present disclosure. The apparatus 700 may be provided as a base station. Referring to fig. 7, apparatus 700 includes a processing component 722, a wireless transmit/receive component 724, an antenna component 726, and signal processing components specific to the wireless interface, and processing component 722 may further include one or more processors. One of the processors in the processing component 722 may be configured to implement the random access method applicable to the base station described in any of the above embodiments.

Fig. 8 is a schematic block diagram illustrating an apparatus 800 for random access in accordance with an embodiment of the present disclosure. For example, the apparatus 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.

Referring to fig. 8, the apparatus 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.

The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the random access method for a first type of terminal described in any of the embodiments above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operations at the apparatus 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

Power components 806 provide power to the various components of device 800. The power components 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the apparatus 800.

The multimedia component 808 includes a screen that provides an output interface between the device 800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed status of the device 800, the relative positioning of the components, such as the display and keypad of the device 800, the sensor assembly 814 may also detect a change in the position of the device 800 or a component of the device 800, the absence of user contact with the device 800, the orientation or acceleration/deceleration of the device 800, and a change in the temperature of the device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The apparatus 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, 4G LTE, 5G NR, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the random access method applicable to the first type of terminal as described in any of the above embodiments.

In an exemplary embodiment, a non-transitory computer readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the apparatus 800, to perform the random access method for a first type of terminal as described in any of the embodiments above is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The method and apparatus provided by the embodiments of the present disclosure are described in detail above, and the principles and embodiments of the present disclosure are explained herein by applying specific examples, and the above description of the embodiments is only used to help understanding the method and core ideas of the present disclosure; meanwhile, for a person skilled in the art, based on the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present disclosure should not be construed as a limitation to the present disclosure.

Claims

1. A random access method, adapted to a first type of terminal, wherein the first type of terminal is configured to carry terminal type indication information in a physical uplink shared channel, PUSCH, of a random access message MsgA, the method includes:

sending MsgA to a base station;

receiving a Random Access Response (RAR) sent by the base station;

2. The method of claim 1, wherein the re-initiating random access comprises:

re-initiating two-step random access; or

And re-initiating the four-step random access.

3. The method of claim 1, wherein the re-initiating two-step random access comprises:

4. The method of claim 1, wherein the reinitiating four-step random access comprises:

5. The method according to any of claims 1-4, wherein prior to or according to the indication of the base station to send Msg3, the method further comprises:

6. The method of claim 5, further comprising:

7. The method of claim 5, wherein the indication of the base station comprises a display indication or an implicit indication.

8. The method of claim 5, wherein the indication of the base station is achieved by the fallback RAR or broadcast information.

9. The method according to any one of claims 1 to 4, wherein the re-initiating random access in response to the RAR being a fallback random access response, fallback RAR, comprises:

10. The method of claim 9, further comprising:

11. The method of claim 9, wherein the preset configuration comprises at least one of:

12. The method of claim 11, wherein the first type of termination comprises a non-capability-reduced RedCap termination and the second type of termination comprises a RedCap termination.

13. A random access method, adapted for a base station, the method comprising:

receiving MsgA sent by a first type terminal;

sending a Random Access Response (RAR) to the terminal, wherein the RAR is a fallback RAR;

random access reinitiated by the receiving terminal or Msg3 sent by the receiving terminal.

14. The method of claim 13, further comprising:

15. The method according to claim 13, wherein the Msg3 sent by the receiving terminal comprises:

and in response to the fact that the terminal does not re-initiate random access under the condition that the terminal receives the fallback RAR, receiving the Msg3 sent by the terminal according to the fallback RAR.

16. The method according to any one of claims 13 to 15, further comprising:

and in response to the fact that the terminal is configured with the preset configuration, prohibiting the first type terminal from carrying terminal type indication information in a PUSCH of the MsgA.

17. The method of claim 16, wherein the preset configuration comprises at least one of:

18. The method of claim 17, wherein the first type of termination comprises a non-capability-reduced RedCap termination and the second type of termination comprises a RedCap termination.

19. A random access apparatus, adapted for a first type of terminal configured to carry terminal type indication information in a physical uplink shared channel, PUSCH, of a random access message MsgA, the apparatus comprising one or more processors configured to:

sending MsgA to a base station;

receiving a Random Access Response (RAR) sent by the base station;

20. A random access apparatus, adapted for a base station, the apparatus comprising one or more processors configured to:

receiving MsgA sent by a first type terminal;

21. A communications apparatus, comprising:

a processor;

a memory for storing a computer program;

wherein the computer program, when executed by a processor, implements the random access method of any of claims 1 to 12.

22. A communications apparatus, comprising:

a processor;

a memory for storing a computer program;

wherein the computer program, when executed by a processor, implements the random access method of any of claims 12 to 18.

23. A computer readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps in the random access method of any of claims 1 to 12.

24. A computer readable storage medium storing a computer program, characterized in that the computer program, when being executed by a processor, realizes the steps in the random access method according to any one of claims 12 to 18.